Gildersleeve, Thomas R.
Prentice-Hall, 1978
Buku Teks
Awad, Elias M.
Prentice-Hall, 1966
Buku Teks SO
Hicks, Tyler Gregory, 1921-
McGraw-Hill, 1986
Buku Referensi
Potter, George B.
Business, 1984
Buku Teks
Fried, Louis
Reston Publishing, 1979
Buku Teks